P0410 Chevy Trailblazer 2004

Question

Check Engine light came on just the other day - Car is running rough with a galloping motion at stops for signal lights, and when idyling. Also started experiencing flashing Service Engine Soon light while driving. Have put in fuel injection cleaner. Should I replace air filter?

Answer 1

P0410 Secondary air injection system malfunction

P0126 Insufficient coolant temperature for stable operation

Flashing CK ENG LT. when the CK ENG LT flashes this is a misfire which is considered catalytic damaging. Check the air filter shine it through a light if you can see light thru it just air clean it and reuse it. I say this because the air filter if it is cleaned out or new is not going to stop the symptoms . P0410 is a code to help warm up the catalytic convertor for cold start to reduce emission which is not the cause of the symptom you have.P0126 insufficient coolant  is not going to cause a flashing CK ENG LT. You have a misfire going on. its either mechanical related or ignition related.